June is one of the warmer months of the year in Thunder Bay, with average highs near 20°C and lows around 8.5°C (mean 14.3°C). It is a relatively wet time of year, averaging 82 mm of rainfall and 74% relative humidity across the period.
June is one of the warmer months of the year in Thunder Bay. Across 45 years of records, the warmest June in Thunder Bay was 1995 — when the month averaged 17.7°C — while the coldest was 2000 at 11.6°C. Typical June days reach 20°C with nights near 8.5°C. The long-term trend is warming, about 0.2°C per decade.
June is a relatively wet time of year in Thunder Bay, averaging 82 mm of rainfall. The wettest June on record was 1981 with 172 mm, while the driest was 1995 at 16 mm.
Relative humidity in Thunder Bay during June averages 74%. The most humid June was 1981 at 82%, and the least humid was 1988 at 63%.
June receives about 5.8 kWh/m²/day of solar energy in Thunder Bay. The sunniest June was 2006 at 6.7 kWh/m²/day, and the cloudiest was 2000 at 5.
Average wind speed in Thunder Bay during June is 0.4 m/s. The windiest Junes were 2020, 2022 and 2024, among others at 0.5 m/s, while the calmest were 2021, 2023 and 2025, among others at 0.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 13.6°C | 14.9°C | 13.9°C | 14.0°C | 15.4°C | +1.8°C |
| Avg High | 19.3°C | 20.9°C | 19.6°C | 19.6°C | 21.3°C | +2°C |
| Avg Low | 7.9°C | 8.8°C | 8.3°C | 8.4°C | 9.4°C | +1.5°C |
| Avg Rain | 89 mm | 67 mm | 88 mm | 91 mm | 73 mm | -15 mm |
June temperatures in Thunder Bay have risen by about 2.5°C between 1981–1985 and 2021–2025.
June has ranged from a record low of -0.4°C (1983) to a record high of 37.8°C (1995).
Rainfall in June is a relatively wet time of year, averaging 82 mm, with a wettest year of 172 mm.
One of the best times to visit Thunder Bay
June is one of the best times to visit Thunder Bay. Expect days averaging 20°C and nights around 8.5°C (mean 14.3°C) — warmer than Thunder Bay's yearly average — with higher rainfall (82 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 21.2°C | 15.2°C | 9.3°C | 26.8°C | 4.3°C | 87 mm | 71% | 0.4 m/s | 5.9 |
| 2024 | 19.6°C | 14.3°C | 8.9°C | 23.8°C | 4.8°C | 128 mm | 77% | 0.5 m/s | 5.1 |
| 2023 | 21.8°C | 15.6°C | 9.3°C | 27.3°C | 4.2°C | 67 mm | 74% | 0.4 m/s | 6 |
| 2022 | 20.1°C | 14.1°C | 8.1°C | 30.3°C | 3.2°C | 53 mm | 74% | 0.5 m/s | 6.2 |
| 2021 | 23.9°C | 17.5°C | 11.2°C | 31.0°C | 6.5°C | 55 mm | 68% | 0.4 m/s | 6.2 |
| 2020 | 21.5°C | 15.4°C | 9.3°C | 28.3°C | 2.4°C | 48 mm | 72% | 0.5 m/s | 6.4 |
| 2019 | 19.7°C | 13.7°C | 7.7°C | 27.1°C | 2.5°C | 71 mm | 71% | 0.4 m/s | 6.4 |
| 2018 | 20.9°C | 15.1°C | 9.2°C | 28.2°C | 4.1°C | 69 mm | 71% | 0.4 m/s | 6.1 |
| 2017 | 19.1°C | 14.0°C | 8.9°C | 25.1°C | 5.0°C | 95 mm | 78% | 0.4 m/s | 5.5 |
| 2016 | 19.2°C | 13.9°C | 8.6°C | 28.0°C | 2.7°C | 122 mm | 77% | 0.5 m/s | 5.4 |
| 2015 | 19.2°C | 13.6°C | 8.0°C | 24.7°C | 2.2°C | 89 mm | 78% | 0.4 m/s | 6 |
| 2014 | 17.9°C | 12.6°C | 7.3°C | 24.4°C | 3.9°C | 109 mm | 79% | 0.5 m/s | 5.5 |
| 2013 | 19.7°C | 13.8°C | 7.8°C | 29.0°C | 0.9°C | 86 mm | 74% | 0.5 m/s | 5.9 |
| 2012 | 21.9°C | 16.0°C | 10.1°C | 26.7°C | 4.5°C | 85 mm | 74% | 0.5 m/s | 6.3 |
| 2011 | 18.3°C | 12.9°C | 7.4°C | 23.8°C | 2.8°C | 107 mm | 76% | 0.5 m/s | 5.6 |
| 2010 | 19.7°C | 14.4°C | 9.2°C | 24.5°C | 4.8°C | 80 mm | 76% | 0.4 m/s | 5.3 |
| 2009 | 18.0°C | 12.7°C | 7.5°C | 28.0°C | 0.3°C | 44 mm | 80% | 0.4 m/s | 5.7 |
| 2008 | 18.5°C | 13.3°C | 8.1°C | 25.2°C | 3.3°C | 161 mm | 79% | 0.5 m/s | 5.5 |
| 2007 | 22.3°C | 16.1°C | 9.8°C | 28.3°C | 4.6°C | 96 mm | 72% | 0.5 m/s | 6.1 |
| 2006 | 22.1°C | 16.2°C | 10.2°C | 26.2°C | 4.9°C | 41 mm | 69% | 0.4 m/s | 6.7 |
| 2005 | 21.1°C | 15.5°C | 10.0°C | 29.3°C | 6.0°C | 111 mm | 77% | 0.5 m/s | 6 |
| 2004 | 18.0°C | 12.3°C | 6.7°C | 23.2°C | 2.8°C | 65 mm | 76% | 0.4 m/s | 6 |
| 2003 | 20.1°C | 13.8°C | 7.5°C | 25.3°C | 4.0°C | 62 mm | 73% | 0.4 m/s | 6.5 |
| 2002 | 19.7°C | 14.0°C | 8.2°C | 27.2°C | 0.1°C | 88 mm | 79% | 0.4 m/s | 5.7 |
| 2001 | 19.2°C | 13.8°C | 8.4°C | 27.8°C | 4.1°C | 88 mm | 79% | 0.4 m/s | 6 |
| 2000 ❄️ | 16.6°C | 11.6°C | 6.7°C | 24.2°C | 0.2°C | 120 mm | 80% | 0.5 m/s | 5 |
| 1999 | 19.1°C | 13.6°C | 8.1°C | 26.7°C | 1.4°C | 60 mm | 78% | 0.4 m/s | 5.8 |
| 1998 | 19.7°C | 14.3°C | 8.9°C | 27.8°C | 2.4°C | 77 mm | 74% | 0.4 m/s | 5.4 |
| 1997 | 21.7°C | 15.3°C | 8.9°C | 28.2°C | 5.2°C | 72 mm | 74% | 0.4 m/s | 6 |
| 1996 | 21.7°C | 15.3°C | 9.0°C | 28.5°C | 3.4°C | 104 mm | 70% | 0.4 m/s | 6.2 |
| 1995 🔥 | 24.5°C | 17.7°C | 11.0°C | 37.8°C | 2.8°C | 16 mm | 64% | 0.4 m/s | 6.1 |
| 1994 | 22.4°C | 16.1°C | 9.7°C | 28.2°C | 1.9°C | 66 mm | 69% | 0.5 m/s | 5.6 |
| 1993 | 19.1°C | 13.2°C | 7.4°C | 28.6°C | 3.2°C | 47 mm | 72% | 0.5 m/s | 5.5 |
| 1992 | 19.0°C | 12.9°C | 6.8°C | 29.2°C | 1.6°C | 38 mm | 68% | 0.4 m/s | 5.5 |
| 1991 | 22.3°C | 16.2°C | 10.1°C | 26.5°C | 5.3°C | 70 mm | 70% | 0.4 m/s | 6.3 |
| 1990 | 19.3°C | 13.9°C | 8.4°C | 26.5°C | 3.0°C | 122 mm | 78% | 0.5 m/s | 5.4 |
| 1989 | 18.2°C | 12.7°C | 7.3°C | 26.1°C | 3.2°C | 72 mm | 75% | 0.5 m/s | 5.2 |
| 1988 | 23.6°C | 16.7°C | 9.7°C | 32.5°C | 4.3°C | 46 mm | 63% | 0.5 m/s | 6.4 |
| 1987 | 22.5°C | 16.2°C | 9.8°C | 29.8°C | 2.7°C | 35 mm | 68% | 0.4 m/s | 6.2 |
| 1986 | 18.3°C | 12.4°C | 6.5°C | 24.8°C | 1.0°C | 107 mm | 73% | 0.5 m/s | 6 |
| 1985 | 17.2°C | 12.0°C | 6.8°C | 22.9°C | 1.0°C | 95 mm | 73% | 0.5 m/s | 5.7 |
| 1984 | 19.1°C | 13.8°C | 8.5°C | 24.0°C | 4.7°C | 138 mm | 80% | 0.5 m/s | 5.2 |
| 1983 | 19.4°C | 13.7°C | 8.0°C | 25.9°C | -0.4°C | 72 mm | 79% | 0.4 m/s | — |
| 1982 | 17.3°C | 11.7°C | 6.2°C | 22.1°C | 1.8°C | 60 mm | 73% | 0.5 m/s | — |
| 1981 🌧️ | 17.7°C | 12.9°C | 8.1°C | 23.3°C | 5.4°C | 172 mm | 82% | 0.4 m/s | — |
Actual recorded June data for each year, 1981–2025 — sourced from NASA POWER.
The average high in June is around 20°C with lows near 8.5°C (mean 14.3°C), based on 45 years of NASA POWER data.
June averages 82 mm of rainfall in Thunder Bay, a relatively wet time of year. The wettest on record was 172 mm in 1981.
The hottest June reached 37.8°C in 1995. The coldest dipped to -0.4°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average June temperatures have risen by about 2.5°C. Daytime highs moved from 18.1°C to 21.3°C and overnight lows from 7.5°C to 9.4°C over the same span.
June is one of the warmer months of the year in Thunder Bay and a relatively wet time of year, so plan for around 20°C daytime highs and 8.5°C at night.
Not quite — June is the 10th coolest month in Thunder Bay, averaging 14.3°C.
For June in Thunder Bay, pack light layers you can adjust through the day, with typical highs of 20°C and lows of 8.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in June averages 74% — moderately humid.
Average wind speed in June is 0.4 m/s. The windiest June on record averaged 0.5 m/s (1982).
The wettest June on record was 1981 with 172 mm. On average, June sees 82 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Thunder Bay behaves each June, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for June specifically, along with year-by-year records and how the month has changed over the decades.
